Just seeking advice on the best way to manage 2 RE batteries for a long ride with a fair bit of climbing coming up. The ride is 125 kms (77 miles) but with 2,750m of climbing (9,000 ft). I will have my internal battery (320 Whr, but now after 140 charge cycles actually 292 Whr at full capacity) and x2 RE batteries (both rated at 160 Whr, 1 brand new and the other down to 145Whr after 76 charge cycles). I'm just wondering what is the best method for managing (and changing when necessary) the 2 RE batteries? Of course I could just go with the 'discharge both simultaneously' as I normally do, and once the internal and 1st RE battery get down to a low level (?5%, or 10% or 15%) and reduce power then put in the 2nd RE battery. Or I could set to discharge the 1st RE battery first, and then change to the 2nd RE battery and then perhaps change back to 'discharge both simultaneously'. There are a number of combinations and permutations, and of course I would want (actually need) to get as much out of all the batteries with a minimum time in the 'low power low battery' state. Any advice/assistance greatly appreciated.